I would like to destroy a subwoofer. 400 watt rms, 3 inch dual 2 ohm voice coil. I need to keep the woofer intact with no visible damage. I just want to destroy one or more of the voice coils. My plan is to connect the voice coil (s) to 110 volt ac. Easy. Just listen to the 60 hz tone until it fails. My other option is to connect the coils up to a 12 voit deep cycle battery with 800 CCA's. What do you think?